Fix RestAPI for tx_retrace and make it work for local boltdb (#584)

* Not hash, keep the files

* Calculate savings

* Fix

* Fix

* Fix

* Fix

* RestAPI to support local boltdb

* Not error on read-only db

* Changes so far

* Continue

* More

* Roll back a bit

* Restore newline

* something compiles

* Fix restapi

* Fix block number

* Fix reads

* Use plain writer

* Maps for storage reads and writes

* Clean up coersions

* Fix accounts/abi/bind

* Fix tests

* More fixes

* more fixes

* More fixes

* Fixes

* Fixed core/state

* Fixed eth tests

* Move code, fix linter

* Fix test

* Fix linter

* Fix linter

* Fix linter, badger_db to support AbstractKV

* Increase IdealBatchSize for badger

* Fix linter

* Fix linter